Someone told me that massaging your scalp with your head upside down is supposed to help grow out hair tremendously! There are tones of youtube videos on it, it stimulates the hair follicles and helps them grow. Good luck!
I could be wrong, but I don't believe a product like this can help your hair grow. only something like vitamins/diet change could do that. But it could help stop breakage which would make your hair appear longer and reduce the need for frequent trims.
I haven't used that product before but i do know that if you want to grow your hair out then you should head to the vitamin section of your local grocery store and pick up some biotin. Its amazing for hair growth and also helps strengthen your nails aaaannddd helps your metabolism!